The winnerPixar's Up remains super-buoyant at the top of the box office, with yet another slim decline – 26% – and cumulative takings of £19.68m. After 17 days on release, the animation is well ahead of Pixar's previous release WALL-E at the same stage of its run last summer (£13.56m) and modestly ahead of Ratatouille (£17.29m). However, Ratatouille's 17-day figure included the whole October half-term holiday from 2007, whereas that has only just begun for Up. The film should have an especially rich period between now and Sunday.

Up has already overtaken the lifetime total of Pixar's worst-performing UK title, Cars (£16.5m), and should soon shoot past Toy Story (£22.3m), WALL-E (£22.9m) and Ratatouille (£24.8m). But it still has a long way to go to challenge Ice Age 3: Dawn of the Dinosaurs' position as 2009's biggest animation: that film, from rival studio Twentieth Century Fox, has been pushed back into cinemas for half-term and has now grossed £34.87m.

The rival animationOffering an alternative to the computer-generated 3D sheen of Up is Wes Anderson's determinedly lo-fi stop-motion animation Fantastic Mr Fox. Debut takings of £1.52m will be seen as not exactly stellar for a family film based on a recognised property (Roald Dahl's 1970 story) – but taking all the factors into account, it's an OK start. In the first place, Anderson has never been mega-box office, and has been on a declining revenue curve since his third movie, 2001's The Royal Tenenbaums: that film, Life Aquatic and Darjeeling Limited opened with £700,000, £455,000 and £435,000, respectively. Secondly, takings for animations outside Disney/Pixar, DreamWorks and Fox's Ice Age stables are hit and miss. Coraline debuted with £2.43m in May; Cloudy With a Chance of Meatballs with £1.58m last month; and Tale of Despereaux with £561,000 last December. The first two titles on that list, unlike Fantastic Mr Fox, benefited from the higher ticket prices of 3D. Take your pick as to which is an appropriate comparison.

A hit franchise stumbles"If it's Halloween, it must be Saw" is the message Lionsgate has been successfully pumping out for five years. And in the UK, since peaking with a £2.52m opening for Saw III in 2006, debut grosses for the ingenious torture franchise have been impressively consistent: Saw IV began its life with £2.48m, and Saw V with £2.44m. Now, at last, Saw takes a stumble: the latest installment has opened with £1.74m. The result echoes a similar underperformance in the US, which had been attributed mostly to competition from low-budget horror phenomenon Paranormal Activity. That film doesn't open until 27 November in the UK, so Saw VI's dip here presumably reflects market saturation after pictures on five consecutive Octobers. Saw VII is set to be in 3D; if only Lionsgate had managed to present Saw VI in the popular format, it might have been a whole different story.

Arthouse goes AWOLLast October, foreign-language releases Gomorrah and I've Loved You So Long both played to packed arthouses, while crossover title The Boy in the Striped Pyjamas appealed widely to upscale audiences. Fast forward to October 2009, and there's a dearth of arthouse hits, unless you count The Imaginarium of Dr Parnassus or smart comedy Zombieland, which we don't. Top arthouse release is eco-documentary The Cove, which, despite lots of press and favorable reviews, opened at the weekened with a blah £18,000 from 27 screens, for a £665 average. The result goes to show how hard it is these days to get audiences to watch environment-themed documentaries in the cinema, even one that promises thrills and spills. The release this Friday of An Education can't come soon enough for the nation's independent cinemas.

The futureMichael Jackson's This Is It is being unveiled to the world at the same time on Tuesday, which is fine if you live in LA (6pm) or New York (9pm), but not so great if you are in London (1am Wednesday morning), Paris (2am) and destinations east. Still, it's all part of the hoopla Sony is building on the concert-rehearsal movie, and Michael Jackson fans should propel it to a stellar debut, especially since Wednesday and Thursday takings will be added in, giving a five-day opening "weekend" result. Advance ticket sales are said to be exceptionally high. After that, it's more about how word of mouth can spread interest beyond the core fanbase.